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P0113 Intake Air Temperature Sensor 1 circuit, P0122 Throttle/Pedal Position Sensor/Switch and P1519 IAC Circuit Malfunction which is manufacturer specific to my Honda Civic 2001 LX. I replaced my TPS sensor a few months ago myself but I'm not sure if the code still persists due to the rest of the codes. If so where should I start and with which code do I start solving first? What are things to look for in terms of diagnosing and fixing, please let me know thank you.

 
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What brand was the tps sensor?

 
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I don’t remember tbh, I got it from the O’Reily

 
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You have the other thread.can't put aftermarket sensors in these cars

 
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then why do they even exist?

 
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...because other companies want to make money through selling a cheaper option?

 
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"There's a sucker born every minute "

 
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there is a demand because people buy them. It don't work once, they buy another